It is impossible to do justice to the full range of Kahneman'sresearch in the limited space available here, and I restrict myfocus to his research programs on judgment and on decision making.Each is defined by an extraordinarily influential article coauthoredwith Tversky: a 1974 Science article on “Judgmentunder Uncertainty: Heuristics and Biases” (which was followed by a1982 anthology with the same title with Slovic and Tversky, and a1979 Econometrica article on prospect theory).